In this guide
Bottom line: Polymarket remains accessible to UK residents but occupies an uncertain regulatory space. British traders can participate via crypto wallets without IP restrictions. Tax implications: earnings are probably taxable under Income Tax brackets (20–45%) or Capital Gains Tax (18–24%). PolyGram delivers a UK-tailored platform interface connected to the same Polymarket liquidity pool.
Within the UK, Polymarket functions as a prediction market in a distinctive legal environment. The UK Gambling Commission (UKGC) has neither granted nor formally restricted Polymarket's operation. Because it functions through blockchain wallets and decentralised smart contracts rather than conventional GBP accounts, it avoids the licensing requirements that apply to established operators such as Betfair and Smarkets.
Is Polymarket Legal in the UK?
Polymarket lacks UKGC authorisation. Nevertheless, it remains unprohibited for British residents. The principal regulatory considerations are:
- Absence of geo-restrictions for UK-based users — in contrast to US-based traders who face blocking
- Crypto-only funding — Polymarket accepts exclusively USDC on Polygon, a digital asset outside the Gambling Act 2005's payment framework
- FCA approach: Digital assets fall under the Financial Services and Markets Act 2023, yet prediction market instruments remain unspecified
- UKGC guidance: As of May 2026, no formal statement has been issued regarding Polymarket specifically
Practically speaking: Since Polymarket's 2020 inception, UK-based participants have experienced uninterrupted service with no recorded regulatory action against individual traders.
Depositing into Polymarket from the UK
Deposit pathways accessible to UK residents via PolyGram:
- Kraken UK: BACS / Faster Payments → acquire USDC → transfer to Polygon address (~10 minutes)
- Coinbase UK: Bank transfer or debit card → USDC → move to Polygon
- PolyGram direct: Visa or Mastercard → USDC credited instantly to your PolyGram account
UK Tax Treatment of Polymarket Winnings
HMRC's approach to crypto-based prediction market profits operates as follows:
- If activity is infrequent (non-professional): Profits may qualify as gambling returns — exempt from tax under existing HMRC rules for spread betting and gambling proceeds
- If activity is frequent/professional: HMRC may deem this commercial activity — liable to Income Tax (20–45%)
- Alternatively, if categorised as crypto holdings: Capital Gains Tax (18–24%) applies when USDC is sold above the annual exemption threshold (£3,000 for 2026)
Uncertainty surrounds the precise tax classification. Numerous UK Polymarket participants treat their returns using cryptocurrency CGT methodology and employ platforms such as Koinly or CoinTracker to produce tax-compliant documentation for HMRC.
UK-Relevant Markets on Polymarket
- UK General Election: Following the 2024 election, the subsequent general election is scheduled for 2029. Active markets exist for by-elections, polling data, and party leadership contests
- Premier League: Championship winner, bottom-three finishers and European qualification markets throughout the campaign
- Champions League: Arsenal, Chelsea, Manchester City — all feature in active European competition markets
- World Cup 2026: England tournament victory odds currently priced at 13–15%
- Bank of England: Interest rate decision markets covering each Monetary Policy Committee announcement
Polymarket vs UK Alternatives
| Platform | UK Access | Regulated | House Edge | Markets |
|---|---|---|---|---|
| Polymarket (via PolyGram) | ✅ Full | Grey zone | ~1% | 8,400+ |
| Betfair Exchange | ✅ Full | UKGC | 5% | ~500 |
| Smarkets | ✅ Full | UKGC | 2% | ~200 |
| Kalshi | ❌ US only | CFTC (US) | ~1% | ~500 |
| Metaculus | ✅ Full | None | N/A (no money) | 5,000+ |
Access UK prediction markets via PolyGram →
FAQ — Polymarket UK
- Do I need to declare Polymarket winnings to HMRC?
- HMRC mandates disclosure of all income subject to taxation. Polymarket returns' taxability hinges on trading intensity and HMRC's categorisation of your activity. Occasional participants might benefit from the gambling exemption; frequent traders typically owe Income Tax or CGT. Seek personalised guidance from a UK tax specialist regarding your circumstances.
- Can I withdraw to a UK bank account?
- Direct withdrawal is unavailable. USDC requires conversion to GBP through a UK-authorised crypto platform (Kraken, Coinbase) before bank transfer. Processing typically requires 1–3 business days via standard Faster Payments.
- Is Polymarket safer than Betfair?
- Betfair operates under UKGC supervision with FSCS safeguards. Polymarket functions on-chain: assets reside within smart contracts rather than a centralised operator — eliminating single-point-of-failure risk but forfeiting FSCS and UKGC protections in the event of technical disputes.